Damage Identification and Influence on Mechanical Properties of Closed Cell Rigid Foams

摘要：

　　The effect of damage on mechanical properties of closed-cell foams is numerically investigated. Representative 3D cell structures are considered for the finite element analysis. In the first instance the mechanical properties were obtained on un-damaged structures. The obtained numerical values for Youngs modulus and Poissons are compared with experimental results. Two types of experimental methods were used to determine the mechanical properties of rigid polyurethane foams: Static compression tests providing stress – strain curves and mechanical properties as Youngs modulus, yield stress, plateau stress, densification and Digital Image Correlation used for identification of the damage mechanism, observation of bands of deformation, Youngs modulus and Poissons ratio. The influence of density on mechanical properties is also investigated. Two types of damages/defects were defined randomly in finite element analyses by considering missing cell walls and filled cells. The results show that the missing cell walls create a decrease of Youngs modulus, while the filled cells produce the increase of Youngs modulus.

关键词： Rigid foams Damage Mechanical properties Numerical analysis Micromechanical models

作者: Liviu Marsavina Dan M. Constantinescu Emanoil Linul Tudor Voiconi Dragos A. Apostol Tomasz Sadowski

作者单位: Department Mechanics and Strength of Materials,Politehnica University of Timisoara,Timisoara 300222, Department of Strength of Materials,University POLITEHNICA of Bucharest,Bucharest 060042,Romania Solid Mechanics Department,Lublin University of Technology,Lublin 20-618,Poland

会议类型: 国际会议

会议名称: 第13届国际断裂大会(ICF2013)

会议地点: 北京

会议语种:英文

页码: 1-7

在线出版日期: 2013-06-16（万方平台首次上网日期，不代表论文的发表时间）